The Premier League winner ran into a three-goal lead, thanks to goals from Naby Keita, Trent Alexander-Arnold and Gini Wijnaldum.
Olivier Giroud scored one for the Blues before the break.
Nevertheless, Roberto Firmino headed Liverpool into a 4-2 lead ten minutes after the restart.
Although Tammy Abraham pulled one back, but Alex Oxlade-Chamberlain goal sealed the match.
When asked specifically about Kepa’s performance, Lampard told reporters after the match:
“I wouldn’t talk about individuals in a game where we conceded goals which are some real quality Liverpool finishes, particularly the free-kick.
“There were some individual errors. We contributed to a very good game. We know where we are at.”